Improvement in door-bolts



R. EICHMULLER.

DOOR-BOLT. No. 189,438. Patented AprllO, 1877.

Iigff Wn e J J 6;. Z-namZr. @9M/Jim@ Ow? @4km W'w /Zd UNITED STATESPATENT OFFICE ROBERT EICHMULLER, OF THOMASTON, CONNECTICUT, ASSIGNOR OFONE- HALF HIS RIGHT TO AARON C. SANFORD, OF SAME PLACE.

IMPROVEMENT IN DOOR-BOLTS.

Specitication forming part of Letters Patent No. 189,438, dated April10, 1877; application filed January 26, 1877.

To all whom it may concern:

Be it known that I, ROBERT EIOHMULLEE, of Thomaston, in the county ofLitchfield and l State of Connecticut, have invented certain new anduseful Improvements in Door-Bolts; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, whereby aperson skilled in the art can make and use the same, reference being hadto the accompanying drawing, and to the letters of reference markedthereon.

Like letters in the figures indicate the saine parts. v

My improvement relates to bolts Iadapted to be mortised into thethickness of a door or shutter, and operated by a knob or handle uponthe outside.

It has for itsobject the production of a mortise-bolt of greatersimplicity and strength than is now commonly used, and one which cau bemore readily and easily placed in its position.

My invention consists iu a bolt operated by means of a rack and pinionmovement, the working parts of which are contained within and held inplace by two cylindrical auger-holes of the same diameter bored into thethickness of the door, and which requires no other cutting or fitting.

In the accompanying drawing, Figure l is a top view of my improved boltremoved from the door, having the bolt-bar slightly thrown out to showthe construction more plainly.

' Fig. 2 is a side view of the interior, with the handle and front haltof the shell removed. Fig. 3 is a front-end view, with all the parts intheir proper positions.

A and B are the two halves of a cylindrical shell, which, when placedtogether, as shown in Figs. l and 3, form a rectangular chamber, inwhich slides the bar C. C is the bolt-bar. It is furnished upon its topside with the rack C', in which works the pinion D. E is a socket orferrule, through which passes the axis of the pinion D to the handle F.The pinion D and the handle F turn together upon a bearing in the socketE. Gr is an escutcheon or plate, intended to rest against and attachedto the side of the door.

The several parts of my improved doorbolt can be made of cast ormalleable iron, or any other suitable metal.

The operation of my invention is as follows: A cylindrical hole is boredin the edge of the door, with a common auger-bit of the proper diameter,to a sufficient depth to contain the shells A B. A hole is then bored inthe side of the door of the proper depth to contain the socket E and thepinion D. This hole is intended to be made with-the same bit, the socketEand the shell A B being of the same diameter. The shell A B is thendriven into its place, and the bar C placed within it. The parts D E F Gare then driven into the hole in the side of the door, so that thesocket E rests in the wood, and the plate G against the face of thedoor. The plate G can then be attached to the door with screws, ifdesired. The bolt bar is then moved out or in, so as to lock or unlockthe door, in the usual manner, by turning the handle F. The bar isprevented from being pushed entirely out of the socket, as the rack doesnot extend quite to the end of the upper side, and thereby forms a stopfor the pinion.

I am aware that the rack-bolt and operating-pinion have been used indoor-bolts, when the auger-holes to contain them have varied in size. Itherefore do not claim those devices as heretofore used.

What I claimas my invention is- The combination of the shells A B, thebolt C, with its rack C', the pinion D, the socket E, and the handle F,constructed and arranged so that the stationary sockets and shells forcontaining and holding the working parts are all contained within thespace formed by two auger-holes of the same diameter bored into thethickness of the door, substantially as herein described.

ROBERT EICHM ULLER.

Witnesses z THEO. G. ELLIS, WILMoT HoEToN.

